. >>> there's now two tree sitters staging an environment show down. tonight a man from fort brag who was arrested in this incident earlier this month returned to the trees. the protesters say the highway 101 bypass will devastate wetlands and pollute waters that are home to salmon and trout. they say it includes a $50 million project to wildlife. >>> peacing together the boston bombings. we talked to experts on how video and pictures that may appear useless could help >>> in campbell about a dozen people took part of a run. the informal run was organized by the owner of a sports shop. he said a number of his customers had qualified to run in the boston marathon. >>> ktvu rob roth spoke to a former fbi agent with all the work involved to find those responsible. >> reporter: stitching together the many hours of video taken before, during and after the explosion is laborious but essential in solving the boston bombings. according to current and former law enforcement officials. rick smith says the fbi will use the videos to create a precised time line. >